Light transport air carrier has near midair collision with small transport in traffic pattern.

Attributes
ACN	246090
Time
Date	199307
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : gon
State Reference	CT
Altitude	msl bound lower : 1100 msl bound upper : 1100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : gon artcc : zme
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 4500 flight time type : 700
ASRS Report	246090
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 600 vertical : 400
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation other

Narrative:

While departing runway 23 at gon, the tower controller issued a left turn to 090 degrees and climb to 3000 ft MSL after departure. After a normal takeoff we started our left turn, while climbing through 1000 ft MSL. My first officer started yelling at me to go down now! I started an immediate descent and looked out the right side cockpit window and saw a twin engine small transport, also starting evasive actions. The small transport was on a left downwind for runway 23, and was never reported to us.

Original NASA ASRS Text

Title: LTT ACR HAS NMAC WITH SMT IN TFC PATTERN.

Narrative: WHILE DEPARTING RWY 23 AT GON, THE TWR CTLR ISSUED A L TURN TO 090 DEGS AND CLB TO 3000 FT MSL AFTER DEP. AFTER A NORMAL TKOF WE STARTED OUR L TURN, WHILE CLBING THROUGH 1000 FT MSL. MY FO STARTED YELLING AT ME TO GO DOWN NOW! I STARTED AN IMMEDIATE DSCNT AND LOOKED OUT THE R SIDE COCKPIT WINDOW AND SAW A TWIN ENG SMT, ALSO STARTING EVASIVE ACTIONS. THE SMT WAS ON A L DOWNWIND FOR RWY 23, AND WAS NEVER RPTED TO US.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.